treewide: allow for running w/o storage

src/config/bot.rs

@@ -0,0 +1,28 @@
+use log::{info, warn};
+
+#[derive(Clone, Debug, Default)]
+pub struct Config {
+	redis_url: Option<String>,
+}
+
+impl Config {
+	pub fn new(redis_url: Option<String>) -> Self {
+		Self { redis_url }
+	}
+
+	pub fn new_from_env() -> Self {
+		let redis_url = std::env::var("BOT_REDIS_URL").ok();
+
+		if let Some(url) = &redis_url {
+			info!("Redis URL is {url}");
+		} else {
+			warn!("BOT_REDIS_URL is empty; features requiring storage will be disabled.");
+		}
+
+		Self::new(redis_url)
+	}
+
+	pub fn redis_url(self) -> Option<String> {
+		self.redis_url
+	}
+}